Here is a pic off the internet of a juvenile Cooper's hawk:
We have one hunting in our backyard. It actually swooped me and the birds one day last week. Two days later, I went out early in the morning to let the chickens out. I always let the young ones out in the aviary first then give some sprouted seeds to the Bobwhite quail. Every one of the quail in the two big pens were frozen in place. I could have picked up any one of them. They didn't even move a muscle when I waved my hand in front of them. I walked out into the yard and there was that Cooper's hawk sitting up in our cork tree scoping out the yard. I chased him away and didn't let the chickens out in that part of the yard for quite a while after that. I have a new respect for my quail. The young chickens were just running around in the covered aviary while the hawk was there but the quail knew better!
I hope not to see any of those in my yard. I do have crows or ravens that hang around (not sure of the differences from a distance) that chase off bigger birds occasionally - as well as a few teeny birds that dive-bomb any predatory birds (and sometimes me) that get around their nests. Their loud CHEEP at the bottom of the dive lets me know to back away from the grapevines.. there is somebody in there.
